Need help with debugging Fault injection

Config
1

I have integrated my application with Istio and it is working fine. I can view the traffic using Grafana. I am trying to inject fault in the poc application. I have modified Virtual Service with http status code 500, I applied the yaml. Still my micro service works fine. How to debug this ?

This is my yaml:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: txms-checking-server
  namespace:
spec:
  hosts:
  - txms-checking-server
  http:
  - fault:
      abort:
        httpStatus: 500
        percent: 100
    match:
    - headers:
        end-user:
          exact: user1
    route:
    - destination:
        host: txms-checking-server
        subset: v1
  - route:
    - destination:
        host: txms-checking-server
        subset: v1
2

@malark
Did you verify that the header end-user: user1 is being passed in your request? Because you are injecting fault by header match.

May be try a simpler match condition on a port, or remove the match condition to verify.